That error message used to be around line 10200 of v8/src/objects.cc, but is no more. It basically means no optimization was currently employed for a particular trace. Possibly because it was unused, or used sufficiently infrequently. It may have likely been a Node.js library function. The address provided is in memory. You'd have to have attached a debugger to v8 and load the symbol for the SharedFunctionInfo at that location. Possibly breakpoint on the line that produces the message too.

I don't think it is that useful to know what was not optimized, as there are lots of things that don't get optimized... just take the output from --trace_opt and assume everything else isn't. It was kind of just a hint that a check was performed for optimized code, and none was there are the time. Maybe try --trace_codegen and work backwards.

This looks to be a very time consuming thing to research.Thorsten Lorenz would be the guy to ask about this.

Email codedump link for locate corresponding JS source of code which is not optimized by V8